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Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
Networking Chapter 15
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Networking Chapter 15

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Transcript

  • 1. NetworkTroubleshooting Chapter 15
  • 2. Objectives• Describe appropriate troubleshooting tools and their functions• Analyze and discuss the troubleshooting process• Tackle a variety of troubleshooting scenarios
  • 3. • Cable Testers, TDRs, and OTDRs – Devices to test for broken cables • Cable testers – Detect continuity problems – Detects if a wire map isn’t correct • b. TDRs – Time domain reflectometer – Identifies the location of a cable break – Works with copper cables
  • 4. • OTDRs – Optical time domain reflectometers (OTDR) – Identifies the location of a cable break – Works with fiber-optic cables
  • 5. • Wi-Fi protected access (WPA) A way of enabling wireless encryption – Certifiers • Only use for slowdowns, not for disconnects • Require a loopback on the far end of cable run • Ensure that a cable can handle its rated capacity – Voltage Event Recorder/Temperature Monitor • Detect power and heat problems • Cause intermittent problems
  • 6. • Protocol Analyzers – Monitor protocols at different layers – Application, Session, Network, and Data Link layers – Both hardware and software tools• Cable Stripper/Snip – Enables you to make UTP cables – Also need crimpers – Often combined in one tool
  • 7. • Multimeters – Test AC and DC voltage – Test resistance • Test continuity • A great fallback when you do not have a cable tester.• Tone Probes and Tone Generators – Work together to identify opposite ends of unlabeled cable runs – Tone generator puts a signal (tone) on wire – Tone probe on opposite end detects the signal
  • 8. • Butt Sets – Hand set – Use to tap into a 66- or 100-block to test a line• 8. Punchdown Tools – Put UTP wires into 66- and 110-blocks – Repunch a connection to make sure contacts are set
  • 9. • Software tools – TRACERT/TRACEROUTE • Traces all routers between two points • Use to discover where a problem lies• Displays IP settings – IPCONFIG without parameters • Basic information only – Ipconfig /all gives configuration details
  • 10. • PING and ARP PING – PING • Queries by name or IP address • Uses ICMP packets • Works across routers • Problem: devices can block ICMP
  • 11. • ARP PING – Queries by IP address – Uses ARP packets – Problem: does not cross routers – Only on UNIX and UNIX-like systems
  • 12. • NSLOOKUP/DIG – Both diagnose DNS problems – NSLOOKUP (all operating systems) • Poor tool • Considered obsolete • Without switches provides name (if available) and IP address of default DNS server• DIG (everyone but Windows) – More powerful

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